ATXMEGA32A4-CU Atmel, ATXMEGA32A4-CU Datasheet - Page 319
ATXMEGA32A4-CU
Manufacturer Part Number
ATXMEGA32A4-CU
Description
MCU AVR 32+4 FLASH 49VFBGA
Manufacturer
Atmel
Series
AVR® XMEGAr
Specifications of ATXMEGA32A4-CU
Core Processor
AVR
Core Size
8/16-Bit
Speed
32MHz
Connectivity
I²C, IrDA, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number Of I /o
34
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.6 V ~ 3.6 V
Data Converters
A/D 12x12b, D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
49-VFBGA
Processor Series
ATXMEGA32x
Core
AVR8
Data Bus Width
8 bit, 16 bit
Data Ram Size
4 KB
Interface Type
I2C, SPI, USART
Maximum Clock Frequency
32 MHz
Number Of Programmable I/os
36
Number Of Timers
5
Operating Supply Voltage
1.6 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
12 bit, 1 Channel
On-chip Dac
2 bit, 1 Channel
For Use With
ATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMRATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPI
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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26.6
26.7
26.8
26.9
8077H–AVR–12/09
DAC clock
Timing constraints
Low Power mode
Calibration
Figure 26-2. DAC output model
Notes:
The DAC is clocked from the Peripheral clock (clk
refresh rate in S/H mode is configured relative to the Peripheral Clock.
Some timing constraints are given to make sure the DAC operates correctly. The timing con-
straints are relative to the frequency of the Peripheral clock. Not meeting the timing constraints
may reduce the accuracy of DAC conversions.
To reduce the power consumption in DAC conversions, the DAC may be set in a Low Power
mode. In Low Power mode, the DAC is turned off between each conversion. Conversion time
will be longer if new conversions are started in this mode. To put the DAC into low power mode,
you need to set the bit 1 in CTRLA register (called DACCRA).
To achieve optimal accuracy, it is possible to calibrate both gain and offset error in the DAC.
There is a 7-bit calibration value for gain adjustment and a 7-bit calibration value for offset
adjustment.
To get the best calibration result it is recommended to use the same VREF, output channel
selection, sampling time, and refresh interval when calibrating as will be used in normal DAC
operation. The theoretical transfer function for the DAC was shown in
Including errors, the DAC output value can be expressed as:
In an ideal DAC, gain is 1 and offset is 0.
V
• The DAC sampling time is the time interval between a completed channel conversion until
• The DAC refresh time is the time interval between each time a channel is updated in dual
DAC voltage
DACxX
starting a new conversion. This should not be less than 1 µs for single channel mode and 1.5
µs for dual channel (S/H) mode.
channel mode. This should not be more than 30 µs.
1. The DAC R
2. The DAC R
=
gain
⋅
CHnDATA
--------------------------- -
0xFFF
channel
channel
Buffer
+
is ~300 Ω for ATxmegaA3 and ATxmegaA4
is ~850 Ω for ATxmegaA1
offset
DAC out
PER
) directly. The DAC conversion interval and
R
R
feedback
channel
”Overview” on page
XMEGA A
DAC output
317.
319
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